Demicryptochironomus (Irmakia) spatulatus Wang & Zheng 1994

Yan, Chuncai, Tang, Hongqu & Wang, Xinhua, 2005, Demicryptochironomus Lenz from China (Diptera: Chironomidae), Zootaxa 910, pp. 1-31 : 22-23

Demicryptochironomus (Irmakia) spatulatus Wang & Zheng 1994 ( Figs. 9 A–C)

Demicryptochironomus (Irmakia) spatulatus Wang & Zheng 1994: 206

Material examined: Holotype (BDN no. 05113) and Paratype (BDN no. 05114) males: Hainan Province, Diaoluo County, 20. V. 1988, light trap, X. Wang.

Diagnostic characters: The species is most similar to D. (I.) banepae . It can be separated by the tennis­racket like anal point with ridges at the base extending to tergite IX and with short lateral setae.

Male imago (n = 2, except when otherwise stated)

Total length 3.53–3.78 mm. Wing length 1.60–1.65 mm. Total length/wing length 2.14–2.36. Wing length/length of profemur 1.88–1.90.

Coloration: Thorax yellowish green, femora of front leg light green, tibiae and tarsi of front leg dark brown, tarsi 1 and 2 of mid leg dark brown, remainder of mid and hind leg yellowish brown. Abdomen yellowish green.

Head: AR 2.03. Ultimate flagellomere 630–670 µm long. Frontal tubercles small, 7 µm long, 5 µm wide. Temporal setae 11–12, including 5–6 inner verticals, 4–6 outer verticals, and 0–2 postorbitals. Clypeus with 13–15 setae. Tentorium 125–150 m long, 37–38 m wide. Palpomere lengths (in µm): 45, 38–48, 135–145, 148–165, 215–220.

Thorax: Antepronotals 4, dorsocentrals 7–11, acrostichals 10–14, prealars 4. Scutellum with 14 or 15 setae.

Wing ( Fig. 9 A): VR 1.19–1.20, R with 20–21 setae, R1 with 16 setae, R4+5 with 26–29 setae. Brachiolum with 2 setae. Squama with 7–9 setae. Anal lobe well developed.

Legs: Front tibia with 2 subapical setae, 130–132 µm; 140–142 µm long, spur of middle tibia 25 µm; 28–30 µm long, comb with 37–38 teeth, 10–12, 11 µm long; spur of hind tibia 25–28 µm; 38 µm long, comb with 40–44 teeth, 10–14, 12 µm long. Tarsus 1 of mid legs with sensilla chaetica 1–2. Lengths (in µm) and proportions of legs:

Hypopygium ( Figs. 9 B, C): Tergite IX with 12–13 setae. Laterosternite IX with 2–4 setae. Anal tergite bands Y­shaped. Anal point 70–75 µm long, spatulate, apically rounded, widened medially, with ridges at base extending to tergite IX, and with short lateral setae. Phallapodeme 70–83 µm long. Transverse sternapodeme 42–47 µm long. Superior volsella slender, parallel sided, 85–92 µm long, rounded and slightly swollen at apex, with 2 long setae, and without microtrichia. Gonocoxite 95–97 µm long and inner margins forming sharp median angle. Gonostylus 185–193 µm long, constricted in middle, slightly bent inward apex, with strong longitudinal keel and 14 inner marginal setae, HR 0.49– 0.52, HV 1.91–1.96.

Distribution: This species is known only from the type locality (Oriental region).

Figures

FIGURE 9. Demicryptochironomus (Irmakia) spatulatus Wang & Zheng 1994. A. Wing. B. Dorsal view of hypopygium. C. Ventral view of hypopygium.